Official Training Baseballs of the MLB, Hitter's eye Trainer baseballs are terrific tools for improving batters' hand-eye coordination. These lightweight, reduced flight balls allow hitters to safely work on hitting a variety of pitches during batting practice. Three models simulate different pitches: fastball (Level A), medium curves (Level AA) and big break curve balls (Level AAA). Using all three you can work on consistently hitting one pitch or mix it up to further sharpen your eye at the plate.